Regionalism (art), an American realist modern art movement that was popular during the 1930s

Regionalism (international relations), the expression of a common sense of identity and purpose combined with the creation and implementation of institutions that express a particular identity and shape collective action within a geographical region

Regionalism (politics), a political ideology that focuses on the interests of a particular region or group of regions, whether traditional or formal

Critical regionalism, in architecture, an approach that strives to counter placelessness and lack of identity in modern architecture by using the building's geographical context